If you have a raft that's large enough, spoon each other and have him enter you. The slow, rocking motions the raft and you both make will surely make you both feel loved by one other.{relatedarticles}

Sit down on one of the steps that go into the pool. Have him lay into you with his feet on the bottom of the pool. Then he can use his waist to move back and forth.

Have him stand on the last rung of the ladder going into the pool. Come up in front of you and face away from him with your feet on the second to last rung. You'll be in front of him and he enters from behind.

You have to love the buoyancy of water. Just jump on him so he is holding you at his waist. He can hold you with his hands on your behind, and move you back and forth.