I.H.
Lust yelped in surprise as he heard Horror teleport into the bathroom, backing up into the shower wall and hitting it.

"H-Horror!?" He squeaked, trying to cover his swollen clit. He was flushed bright purple in embarrassment and arousal.

Stars, Horror's dominating scent was making his head feel dizzy. He could feel his eyelights growing large and hazy, muddling his thoughts. He needed to escape, but it was getting increasingly harder to think.

G.P.
He opened the shower, looking at him happily. It was such a wonderful feeling having his pet already ready for him, taking off his pants. He winced at the screaming in the back of his head... Maybe he could still get out of this. Maybe maybe maybe..

He backed up; he couldn't just.. He shouldn't, but Lust smelled so good.."I'm... sorry.." He shouldn't force himself on this monster that obviously didn't even like him. He was such an idiot. "Thank god Alphys. You're a godsend with your drugs.." Horror teleported all of the clothes away into the basement.

I.H.
Lust almost moaned out loud as he caught sight of Horror's dick. Gods, it was so big! And it was already weeping with arousal. The thought of it inside almost made him want to cry.

"It hurts.." He whimpered, feeling his swollen magic throb painfully. Why did heats have to be so painful? "H-Horror.." Stars, he needed Horror's help. But he also wasn't sure if this was the right decision, especially with his head so fuzzy right now.

G.P.
"I-I don't..." He shook his head, getting into the shower and grinning. "I'll make it feel better; don't worry about it, my beloved pet~" He pulled the other closer to him. "You say stop whenever you want."

He didn't know anymore. He couldn't just.. Yet he wanted to; if this really did grab the other's attention, then he'd rather help the other with his needs. After all, people needed help in some way or another.. Justifying his actions, he slowly pushed his fingers into the other's hole, beginning to slowly pump them in and out. He didn't want to hurt his pet after all..

I.H.
Lust cried out at the intrusion, bucking unconsciously into his hand and forcing his fingers deeper. Tears pricked at his sockets as he gasped out loud.

"Mnnhn..! H-Horror!" He cried, heart shaped eyelights blowing wide and hazy. The slick sounds of the other's fingers entering him made his arousal even stronger.

G.P.
"It's fine.. It's fine, just calm down for a moment, ok~..?" He licked out his wound, humming at the sweet taste. His cock pulsed slightly as he inserted a third finger and quickened his pace.

He felt like this was terribly wrong; he shouldn't do this. Yet his instincts kept telling him to do so.. He pulled out his finger as Lust adjusted, rubbing his cock on his pet's swollen clit. He turned silent before slowly popping in the tip. He wanted to go slow; harming him would only make things worse for the two. He would give the other a quick fuck before leaving, he told himself..

I.H.
Lust put his hand to his mouth, stifling a scream as he felt Horror enter him. Oh dear gods, it already felt so big! He whined, trying to grind downward and force more of it inside him but Horror was holding him up, making him wait.

A string of pleas and Horror's name spilled past Lust's teeth as he gave the larger skeleton the most pitiable look, a tear sliding down his cheekbone as he tried to force more of Horror into him.

"I-It hurts Horror.. Pl-Please.." Lust whimpered, feeling his heat practically demanding him to take in all of Horror, the pain only increasing the longer he waited.

G.P.
He hummed. "It's fine. Here.." He slowly began to slide himself into the other, finally filling him all the way.. He kissed Lust back.. "You can move anytime you want.." He murmured, letting go of the other's hands as he looked away. The other seemed so horny for him.. He didn't even get why or how. He would probably regret this later..

I.H.
Lust wrapped a leg around Horror, kissing him back slowly and tangling their tongues together in a sensual dance. His face was flushed deep lilac, reflecting off of his hazy violet eyelights.

Their panting and sighing filled the bathroom, the water still running and making their bones both slick as they wrapped around each other. Lust broke the kiss to take a breath before going back again, moving up and down on Horror's cock.

It had a considerable girth that had Lust's walls stretching to accommodate its size. He began to speed up the pace, obviously chasing after his finish as he wrapped his arms around Horror's neck and panted, looking down at where they were joined.

Red and purple cum slicked their passage, allowing Horror's length to enter and exit with lewd squelching sounds that filled the heated bathroom.

G.P.
Horror was excited that the other was so.. wanting towards him. It made him feel rather special that the other needed him and only him right now.. He moaned out as he forced the other to kiss him again. He had never been kissed before and the feeling made him ecstatic. He enjoyed the tight feeling around his cock as the other moved, now stroking at the other's spine.

I.H.
Lust clenched around the dick inside him, moaning at the feeling. He obliged Horror, kissing again deeply, the wet sound of their kiss only being matched by the slick squelching of their magic rutting together.

He came rather quickly around Horror, stifling his scream into the larger skeleton's shoulder before slowly picking up his pace again. He felt so desperate to have the other's seed inside him, filling him up.

Author: My friend drew this scene so I had to attach it here. XD