"Baby, I...I feel so strange." Your transformed girlfriend/ideal mom can't help but see you in a new light, one that is maternal but non-platonic. To that end, her chest tightens and she wonders if you've been eating properly.
You chuckle as you throw away your pants, revealing your boner which wags for your fake mommy. Seeing this, your girlfriend feels a tinge of pride well up. "Oh, you've grown...so well." she adores you.
"Of course," you reply, lifting your head proudly.
"But, you'll always be my baby. Come here to mommy," she coos, motioning as she undresses, revealing her beautiful and plump breasts which are now leaking. After seeing this, your transformed girlfriend now understands what she has to do and what her new body has been crying out for - she needs to breastfeed her son-boyfriend.
This is within your expectations, but you weren't sure how much it would play a role in the transformation of her behavior. Just like her leaking breasts, you figure you'd just go with the flow.
Entering the bed with her, she spreads her legs first with a warm, eager smile and let out a small gasp as you entered her. This by itself isn't new but now as a mother, she feels the need to caress you more. "Baby, closer."
You follow her guidance and gentle motions of her hands which lead her to push your face into her right breast first. Grunting, you latch on and while drawing sweet milk, you begin thrusting below.
"Oh! Yes, my sweet baby..."
Like her milk, she lets out equally sweet moans and holds you tightly, not wanting to let you go. With bouts to gasp for air, you remain pretty much locked to her chest to nurse as your lower half pounds her. Occasionally, she would let go of your head and pull you up to lock lips with you which reinvigorates your momentum.
After a half-hour of sex and nursing, you outspent yourself and soon lied with your former girlfriend, cuddled against her body as she strokes your hair with her fingers and kisses your forehead.
"Becoming your ideal mom is the best, sweetie... thank you. I feel so at ease with you."
"Glad you enjoy it." You hum, plenty satisfied.