You little nasties wanted a clop chapter, so here wE gO. XD
(I'm really new to this sOooOo) also,  to clarify, Spike is older in this AU!

Shining watched Spike trying to get comfortable in their shared bed.  Spike snuggled beside him, purring, enjoying every moment.  Shining had been fighting urges to touch the little dragon. Not just a hug or kiss. He wanted to try intercourse with the little drake.

He got closer,  spooning the smaller dragon, wrapping his hooves around Spike's waist. Spike's nose twitched as he smiled.  He felt something hard poking him. Confused he opened his eyes.

"Shiny?" Spike asked, looking back innocently.

"Shh.." Shining slowly grinded against him.  Spike softly moaned, moving to face him.  Shining stood above him,  pinning him,  his back hoof on Spike's tail. Spike shivered.

"Shining.. Are you sure about this? You're still m-married to Cadence.." Spike whisper, trying to keep his eyes on Shining's face.

"Shh.. We have permission.. She's the princess of love,  Spikey, she encouraged this." 

Spike nodded, "O-Okay.. Be gentle please.. I've never done this.."

Shining nodded and slowly began to push his length into the drake. Spike gasped,  moaning softly. Shining slowly thrusted, keeping a steady pace. Spike gripped the bed, tightly, biting his lip. Shining kissed him roughly, his thrusts getting faster and less gentle. Spike slipped his tongue in,  his member twitching. He could feel himself getting close.  Shining felt the same,  going faster and sloppily kissing Spike.

"Sh-Shining..!" Spike gasped, arching his back. Shining grunted, climaxing inside Spike as Spike came. Shining flopped beside him,  pulling him close, panting.  Spike was completely out of it. Shining kissed his head and they both dozed off.