Help me out with this guy i like? please?

hey, :) i'm seeing this guy i like wednesday, and were gonna be with about 4 other friends, so we'll be 6 in all . And were gonna be going in my pool and spa at night time .And what should i do to make him all interested in me? At some point i'll go in the pool, alone. while everyonesin the spa, and i'll turn the lights off in the pool, and he'll probably come in the pool with me, while the others are in the spa. What should i talk to him about? and how should i flirt with him in the pool, should i like go under water & and pop up behind him and kiss him, i really want to start something with him . help, please answer with serious answers <3xxo :)