solely physical relationship with older guy

hi, I'm fifteen and this guy I used to have oral sex with is in town and I used to love him or at least lust after him I guess iDk. he's nineteen. please don't say anything about ages how I shouldn't do it because of the age difference that isn't what I'm asking here. i just have a boyfriend now. please don't say anything about that either. but if I can have sex with this older guy and not have feelings, is it ok to just enjoy him physically for the week he is here? I wouldn't get attached and we enjoy each other's company as friends and he says when I am legal we can date and be public but isn't it fine for us to enjoy some physical safe sex as long as I don't let myself think it is something it is not.