Take your erect cock in your hand, then instead of tugging or stroking your shaft rub your cock head rhythmically against the bedclothes. It leads to a long slow rise to your cum. Best performed in bed on all fours with your cock hanging down and something under you to catch your spurt. I discovered this method because my bed rattled and creaked if I wanked the "normal" way on my back tugging my cock but this other way didn't cause any noise.
As a lifelong fan of spanking, I discovered in my teens that I could lay face down and rub against the bed and my hand while picturing myself over a girl's lap. To contain the squirt I would use an old discard skirt of my sister's. I'll still do that on occasion now if I have trouble sleeping.