well this is the dream, this is what im looking for aswell, unfortunately its rare it seems. I have had luck asking for 15 minutes at some massage parlours. some of the girls in the escorts section on leolist will offer this aswell but you really just have to ask them, and alot will say no, and some will only do it for their regulars
lindsey 6218, offers 15 minute hj for $80, but she is older than your age range you asked for. still not bad, shes pretty hot for her age and gives good service. im sure you could get a bj from her aswell