@Lex79 he's gotten a few blowjobs from Airi by "accident" but I'm guessing you want him to actually penetrate a girl... too bad the beasts are the only ones getting in any of those holes.
@CountryMage I don't necessarily need actual sex, I kept reading because I was hoping this was at least the typical ecchi manga with the protagonist doing perverted things with the girls, but I guess I was wrong. Tentacle rape is not my thing and this is mainly about it, so I'm out.
The entire 3rd volume is nothing more than some form of tentacle rape to the various girls. I think every chapter one or the other is getting hosed. Well the start of the volume Ayana is getting molested by a bunch of guys.
Volume 4 is the when the action happens after them getting jealous from the new cat girl that appeared in volume 3 so they invade his bath. Also still plenty of tentacle rape. The mangaka is seriously fucked in the head with that shit.
Skipped volume 5 fuck all that tentacle shit.
Volume 6 was a flashback volume that got a little dark with some flashbacks. Ending was ambiguous with the 4 girls as most of these type are.