Impregnating my step sister Tara

Tara's husband has been trying to get her pregnant, with no success yet. The results of recent hospital tests show that he is infertile. They could either adopt or they could use someone else's sperm to impregnate her. Since you look so much like her husband, Tara wants to use your sperm. You agree to this and she coaches you thorough a little practice session. Her sexy body is more than enough inspiration for you, but the way she speaks to you, encouraging you to stroke yourself is perfect. She spreads her pussy and she begs you to fill up her pussy with your healthy sperm. Tara is on her back ready to accept your load of potential babies deep inside of her pussy, since that is the best position for conception. You want nothing more than to fill her pussy with a huge load of sperm, and you pump and pump until your dick explodes way deep inside of her.