hmmmmmmmm just having a think for you. I do like some watersports fun when in the mood. When I think back through the last year or two, most of the SP's have been in their 30's or older MILF types as they tend to be filthier and more experienced than the youngens.
I've had great WS fun with Harriet Appleby on many occasions. She's a mid 30's girl next door type, very pretty imo and around a size 14 maybe

But she will piss like a waterfall wherever you want it. I like to lick her pussy as she does, very hot. Another couple would be Chloe Bunny or Angela in Bury, but again both are out of your age range.
I cant think of any under 30's that I would want to piss on me tbf

Hope that helps.