Isekai Reincarnation Magic Cock

I was walking home to sleep after work, but on my way home I was hit by a car....
“Am I dead?”
A second after I opened my eyes, a beautiful Goddess shrouded in white light asked:
“To save the world of Isekai, what special abilities do you need?
A super-powerful weapon? Or super-powerful magic?”
Even with these tempting options lying in front of me, I still want to fulfill my wish before I die:
“Either way, please give me a magic cock that I can fuck anyone with!”
And now, with this powerful magic cock in my hand.
In this world of Isekai, which is about to be conquered by the Demon King's army, I'm going to save the world by having sex!