You recognise the shadow, its one of your neighbours kids

You realise who it is, its Brad your nextdoor neighbours 16 year old son. You tell Jessica that your legs need a stretch before you begin so your going to quickly get up and walk round the room. She says thats fine. You get up and head to Brad who recognised you, tucking your cock away as you walk toward him. You signal that he not speak and take out your phone, you open up an app and type a message and show him your screen "What do you think of her, Brad?", he takes the phone and types a response "omg man, your the luckiest man alive she is super tidy, look at them titties!", you take the phone back and type "wanna see them up close maybe touch them?", He responds on the phone, "yes", you type a message " you cant say anything near her, she has to think its me", he nods and heads over with you. Your both beside her and he leans down and cups her 38DD chest she moans and says "I need you in me now, I have to get home soon or my partner is going to be suspicious". You signal to him would he like to try her out, he nods. You type a message, "here's a rubber", he types one back "i heard the speech she's expecting a bare cock, wont she be suspicious?", you realise he is correct so type another message "do not cum inside her pussy" you realise that based on his just legal age he's probably more virile than you are, your regretting this part of your plan, he nods in agreement. He is already hard and is sporting a respectable 7.5" cock, a little thicker than yours, he spits on his hand and moistens his cock and then lines it up with her drooling fertile cunt. "What are you waiting on?" she asks sounding increasingly annoyed, you reply "Just extending the pleasure, fun is in the not knowing when ill enter you", she lets out a hmmph sound expressing that shes getting tired of waiting. He rubs his cock head up and down her slit, "Stick it in" she exclaims, he proceeds to do exactly that right to the hilt eliciting and argh then a moan from her, "you feel thicker, oh oh oooh", hes starting to ride her like a cheap whore and shes moaning continuously , when he slows down you lean down and say "the pills make it change shape and length depending on how long after Ive taken then it is", you look at his face and he looks like hes enjoying her, perhaps a bit too much. He switches from slow fucking to really hammering her deep and then I see his face change and realise he is pumping his load directly into her fertile womb, she realises too when he jams his cock as deep as possible and then stops hold her impaled on him. She says "what the hell John, do you want me to get pregnant? two loads right in my cervix? are you insane?", before you can stop her she pulls off the blindfold and turns around seeing brad still balls deep in her, still spraying her womb. The look of terror on her face "who the hell is this? how old is he 13? do you know how virile he will be? How did he get inside me? what if he has a disease? I cant believe you'd do this to me" , you respond.