She's too horny to wait

Your sister cant' stand it anymore, she immediately barges in and puts her lips around your massive cockshaft and starts sucking it like a Popsicle, you groan at the intense pleasure coursing through your veins. Your sister is incredibly skilled at giving you a blowjob, she must've done this before, she grabs your swollen nuts and starts sucking them like a grapefruit. The pleasure is incredibly intense and you are whimpering in delicious agony on the verge of having the most explosive orgasm of your life, your sister sensing this switches back to your cock and gives it the gentlest little flick with her tongue right underneath your shaft, that's all it takes and suddenly you scream yourself hoarse as you feel fireworks going off in your brain as the most intense pleasure of your entire life surges through your shaft and explodes all over your sister's face, your orgasm goes on and on for several minutes before finally dying down, when it's over your sister's face is absolutely drenched in your cum.