Originally Posted by RLAJay

Bruised cock, happens when you have an erection for a long period of time, capillaries start to split from the over engorgement of blood for too long. Common porn injury.

Goes after 12-24 hours. Should be gone now in fact. The sore sounds like a friction burn, probably too much masturbation done too roughly. That'll probably scab very slightly and disappear in days.

Her discomfort is probably far more than yours.