Not bad. The sex dialogue is a step lower than the out of sex dialogue, but the creator has a good sense of framing and decent character designs. The only really bad things are the font choice and the fact that it's not longer.
Might be nitpicking, but this isn't cheating. Cheating is going behind your SO's back to fuck other people without their knowing or permission. So that cheating tag should really be removed and switched out for some else if it exists. Something like "open relationship" maybe.