Sooooo is he still sleeping with the short guy or what?

Heavily implied that seme (MC) slept with short twink to keep him away from Nanjo (ML) since he’s jealous. But since the scene was cut we don’t know the extent or details of their sexual encounter on the tattoo business (did they go all the way? Did seme only use his hands? Unclear. But short twink did left satisfied and was shown without pants).
Now if you’re asking about Nanjo, short guy left it clear he’s always “busy” and they haven’t been together.