You accept her offer

You realize that the thought of spending your life with Sarah makes you happier than anything else. “Of course I accept Sarah” You say with a smile.

Sarah gasps, then she smiles back, the absolute joy in her eyes filling you with butterflies.

“Oh thank you Dougie! You have no idea how happy I am to hear that”, a tear of joy runs down her face as she re-centers her dick on your hole “Ready?” she asks, you nod and immediately gasp as she lowers you onto her cock, prodding at your ring.

You clench your eyes and thank the stars that you never stopped with your anal stretching. A lot of boys your age never bothered, foolishly thinking that it was a waste of time. Those boys hadn’t considered the girth of a girls cock, and how painful it would be to take the first time if they weren’t loose.

Despite this Sarah still had to put effort into penetrating you, not many women had a cock as thick as hers. You groaned again as you felt your ring give way, her head slipping inside you. The soap still on her cock acting as a lubricant.

“Oh Dougie… You’re so tight” Sarah hisses as inch after inch of her cock slipps into you. You moan in response, the initial pain of her entrance swiftly giving way to pleasure. Halfway down Sarah stops for a moment, savoring the feeling before lifting you back up. As she pulls out you feel an overwhelming emptiness filling you. Once only the glans remains inside you she pulls you back down, faster this time, now six inches deep she repeats the process, each time thrusting harder, each time shoving her cock deeper into your cavity. Finally all 10 inches of her cock are inside you, the feeling of fullness within you is indescribably.

She smiles as she lifts you up again and says “Ok, now we can get serious” you begin to acknowledge her but are interrupted as she slams down, hilting herself once again. You cry out in pleasure as she begins to fuck you, nearly throwing you up in the air as she impales you over and over.

You cry out as you experience a second orgasm, you feel your cum smear onto your dick as Sarah’s stomach rubs against it, the added stimulation eventually causing you to harden once again.

After nearly 10 minutes you feel a change in Sarah’s tempo, her breathing gets heavier, her thrusts are slower, but with each thrust she slams into so hard you see stars. “I’m going to cum Dougie! Take it all!” She cries, hilting one last time and cumming.

You feel what can only be described as a fountain of jizz fill your guts, the stimulation causing you to ejaculate for a third time in a single night. You cry out and hug Sarah tightly as it happens.

You lose track of how long Sarah cums, but by the end your stomach is bloated, a passerby would mistake you for 7 months pregnant if they saw you now. Sarah sighs contentedly as she pulls out of you with a pop, lowering you back into the now cooled bathwater.

“That was amazing Doug” she pants, exhausted by your vigorous lovemaking, you nod in agreement. You feel her softening cock press against your lips and you immediately part them to accept her meat. After using you to clean her cock off she pulls out, one last spurt of cum fills your mouth, some spilling out between her cock and your lips and running down your chest. You swallow your gift and Sarah smiles.

You take your time cleaning up, Sarah helping you wash again. You feel like you can walk again now (Though with an obvious waddle) but Sarah still picks you up and carries you to her room, you wouldn’t be needing your own anymore. You curl up with Sarah, her cock resting atop yours, both of you too drained to even think about sex now.

“We’ll tell them tomorrow to make it official, but Mom and Crystal definitely heard us finish” Sarah sleepily, giving you a quick, chaste kiss as you blush.