Starlight wants the alicorn D, alas Twilight isn't exactly feeling up to it. Unfortunately for Twilight, Starlight is quite determined to get what she wants.

kinks Anthro, Stomach bulge, large endowments, cum inflation, futa on female, impregnation, starlight being sexy, and probably more that I'm forgetting.

Done as a request from a patron! Head on over there if you want the chance of getting your own story like this for just 5 bucks!