M4F, RP as my Friends experienced, slutty sister

Please be willing to discuss the rp a little first. I have a whole range of refs that you can select to play as, or you can bring your own if you wish (age range of 18-25), though I much prefer her to at least have either a big ass or big tits. We've known each other for a little while, and though I have a huge crush on you, I am way too nervous to try anything. One day we're chilling by the pool when my friend gets called into work. We get to talking and you find out that I'm a virgin which you think is cute. Looking for a detailed or at least semi-detailed role-player please.
My character: 23, Male, 5'8, Slim but defined build, under endowed (small dick)
Kinks: Slice of Life, romance, virginity loss, experienced partner, big tits/big ass, revealing clothes, bikinis/lingerie, heels, tight dresses, gentle femdom, average guy with hot girl, below average penis size