The scene should go like this. He is holding her in a tight embrace while kissing her on the back of her neck. She is moaning softly with a smile on her face and with her eyes wide open with a bit of a teary misty look while he slowly goes at it from behind slowly in a tight embrace. The characters I want to use for this scene is Shampoo from Ranma 1/2 and a minor character who only appeared in one game named Yuta. PM me for details.