You couldn't keep it in any longer...

Seeing Emma grab and pull on her tits while she rides Mason and call out his name in her own orgasmic esctacy was the final straw for you.

You pass the point of no return and you feel your dick about to cum. You stop stroking but it's too late and your jizz spurts out of your cock onto the floor.

Emma is so caught up in own orgasm that she doesn't notice that you blew your load. After her body has stopped shaking Mason lays her down on the couch missionary style and starts plowing into her. He doesn't last long and quickly announces that he's going to cum. Emma grabs his ass with both hands pulling him even harder into her pussy. "Cum for me, cum for me," Emma begs.

Mason grunts repeatedly in what is obviously his orgasm and Emma reacts by the feeling of his cum shooting inside her by oohing and aahing in glee.

When Emma has regained her composure she pushes Mason off of her. You can see Mason's cum already beginning to leak out of Emma pussy. Only then looks over to you. When she see the cum still dripping down from your withered dick and gasps in horror "Oh no, who's gonna fuck me next then!"