Try the direct approach

"Oh my" you purr from your position sprawled on the floor "Is all that for me?"

Paul blushes and covers herself with his book as you smirk and crawl towards him your ass in the air.

"Hey stop that." he protests but he doesn't try and stop you as you reach up to rub his crotch

"Mmm, I had no idea you were such a big boy" you say "It seems a waste to be packing a monster like that and never use it. Tee-hee and I think he wants to come out to play."

You start trying to unbutton his fly genuinely curious to get a better look at what he's packing....