his hands were on her hips , turning her on her side , and his mouth was running down between her thighs , parting them to his tongue and thrusting into the sweetness there , and when neither of them could bear it an instant longer , he moved on top of her and slowly slid inside her , thrusting deep and making gently circling motions and she began to move to his rhythm , their rhythm , the rhythm of the universe , and everything began to move faster and faster , spinning out of control , until there was a vast ecstatic explosion and the earth became still and peaceful again .