The thrusting in and out of his ass isn't comfortable at all, even if it's nearly as sensitive in there as it is inside his pussy. Probably because he wasn't prepped much at all beforehand--scratch that, not at all, and he'd never had anything up there before.

Not that it makes him any less aroused than before, as he's still wet enough for the tentacles to keep going in and out of him easily. He's surprised nothing has torn yet, even though his abdomen feels past the point of bursting every couple thrusts.

And somehow that's a good feeling, if the pleasured groans and gasps are any indication.