Initially he thought he could do it, but then he fell in love with someone and ended up not wanting to do stuff like lovers do, like sex.
I feel like it was initially inclined that sex was off the table, like that it wasn’t included. He said so with his first client who he ended up falling for that he’d give him a blow job but he wasn’t ‘allowed’ to put it in. That’s why there was no actual penetration until the last chapter (where the Seme wasn’t a client at the moment). Some escort services are like that and/ or the Uke was allowed to state how far they are willing to go with a client and that it would be stated when the client reserved him.
At least at proper escort services that’s how it should be done. But well, this is the real world so…people feel they can do whatever they please.
I'm here like "But honey, wasn't that supposed to be your job? Wouldn't you expect your customer to want to get what he's paying for?" And yeah, I'm all for No Means No, but come on, how did you get to that point?