dean holds on to cas’ shoulders so tight when cas is riding him he leaves finger marks and it always surprises cas when he can still see them in the mirror but then he looks at his mark on dean and realizes its because he wants to see them there. it makes him take dean even deeper when he leans over and his mouth is at deans shoulder, he can feel deans pulse throbbing and tastes all the sweat leaking from his skin and the tears from his eyes because everything is burning but he turns and puts his hand on his own print on his lovers shoulder just below his own line of sight and it fits so right when he squeezes dean’s muscle he responds so furiously cas can barely hold on. cas knows only to do it when dean’s close because he’ll never last more than a couple seconds after that. he does love to see deans fingers outlined in his skin though, and will do it whenever he pleases because he is a brat.