Well with my ex we kissed for ages and I got on top of him fully clothed and started grinding while still kissing him. He was really hard. He started touching my breasts and putting his hands down my pants. He had to leave soon for work so when he took his jeans off to put his work pants on he showed me the wet mark in his boxers from pre-cum and then on his penis, I licked it off. I suppose it's just when a guy gets really really horny.
Push him onto the bed and strip to your bra and undie, then crawl on top him and kiss him then play with his neck and blow nice and gentle in his ear then lick his ear and bite it gently. Whisper in his ear things like I want you to rock my world... then lick and bite on his neck and suck on it too all gently, run your hands up and down his chest and slowly move down on him :)