As the title says, the character has sex when he sleep. The other guy is his friend who is in love with him. The friend doesn't say anything to him but then the guy finds scratch marks on his back. The manga ends with the guy running out of medication before a trip together.

Thank you!

There's an old saying my late grandma taught me. When you're ten, they call you prodigy. When you're fifteen, they call you a genius. Once you hit twenty, you're just an ordinary person. About three years until I'm ordinary. Man... I can't wait to be ordinary.

Is it Nemuri Otoko to Koi Otoko by Zaria?

OMG YES. Thank you!! 😀

There's an old saying my late grandma taught me. When you're ten, they call you prodigy. When you're fifteen, they call you a genius. Once you hit twenty, you're just an ordinary person. About three years until I'm ordinary. Man... I can't wait to be ordinary.