Hinata's mom was going to visit a close relative.
Hinata doesn't really want to go to the visit so, he stayed at home. He gave kageyama a call and told him to come over.

Then kageyama came over to his boyfriend house, they sat down on the couch hinata wanted to spent some quality time together. Kageyama also had the same idea so they watch a movie together, after they ate a bunch of food and finish the movie hinata start kissing kageyama on his neck, then kageyama push hinata on his bed and start undressing him so he could kiss him all oven his body, until hinata and kageyama wear only their underwears.

Natsu came over to the room then hinata push kageyama to the floor.

Natsu saw hinata and kageyama undressed, kageyama in the floor and looking embarrassed hinata was in bed. Then hinata ask natsu

- Natsu why are you here, weren't you suppose to be with mom

Natsu was feeling a liltle blue so she couldn't go

Then it was natsu's time to ask things and she said all innocent

- Why nii-chan and tobio are naked and why nii-chan  was makeing weird noise all the time?

Hinata's face was red and kageyama was on the same situation.
.
.
.
-Did you heard us ? They say together

-Yeah you woke me up nii-chan...

- we were playing natsu a game I am sorry now go back to sleep

After this kageyama and hinata were doing thinks only in kageyama's house.