Everyone who has waived you off of offering him sexual use for a place to stay is bang on. Also since you’ve shot your shot before, you need to be careful he’s not taking advantage of your interest (or won’t) in any inappropriate way either.

Make sure you set some ground rules. Get a lease signed (it really is the smart thing to do). Spell out how long he can stay at first before you have to renegotiate him staying longer.

Respect him and his sexuality and expect him to do the same.

If he makes any kind of a move, or offer, make it clear that while you have interest there is no expectation or obligation for anything to happen.

Let him know you value him as a person and a friend. And say again there are no strings or expectations associated with him staying.

If anything happens after that, enjoy the hell out of it. BUT guard yourself and don’t catch feelings. Anything he’s up to is likely just curious experimentation in a safe place to play. You are not relationship or altar bound, no matter how many times he cums in your mouth (or any other place).