My girlfriend is going to be late and my sister-in-law offers to suck my cock

My girlfriend is going to be late and my sister-in-law offers me my favorite drink and to pass the time she wants to suck my cock, the truth is that it is a great idea, she is very skillful with her tongue and her mouth, she does it so well that she gets an epic cumshot on her face, hot and thick, I don't know if there will be any semen left for my girlfriend