Frotting gets me rock hard… I drool a lot of precum. I used to straddle my ex’s lap facing them, grab their 10-11” cock and start frotting with mine limp and my 5” cock would be hard so quick. He would tease my body while letting me grind/frot with his dick, using my precum on my nips etc. Sometimes I’d cum on his dick while frotting and he would pull me into position and push right inside me