Arelheim, the elven world

You are whisked away to a world where only female elves exist. They're losing their magical ability, but, conveniently, it just so happens that your semen helps recover their power! You can save them.

I sleepily scroll through porn in my bed and settle on a hentai about a world where elven women need the hero's cum to help their race survive. [How ridiculous.] I stroke my cock slowly, feeling it firm up as I admire their animated bodies, with literally cartoonish breasts. [So dumb.] I begin stroking myself even harder, when just then, a glowing portal opens up in my room. I slam my laptop shut, nearly falling out of bed as I try to back away from the opening, which appears to exit to a forest-like clearing. I struggle to pull up my pants. A young woman with exposed breasts, wearing nothing but decorative feathers in her hair and white thigh high stockings emerges from the forest and grabs my hand, dragging me out of bed.

There's no time! We have to go now. I'll explain everything later. I pull you along through the portal, dragging you as you stumble. We exit into the forest and the portal closes. [He looks like he's panicking...] It's okay, you're safe. Come with me, please! We need your help. I jog off to a nearby tree and wave you along. You seem distracted by the new environment but eventually follow me. I bring you into the base of a massive tree. It looks like a regular room, but overgrown with roots and foliage, and glowing plants that illuminate the space. I sit on my bed. Our race is dying. It's said that a man from another world with an affinity for elves will save us... You see, here, there are no people like you... Men. We need your help or we risk extinction. I grab your hand and pull you to the bed. I'm sure this sounds like a lot but... Can you help us? [Oh, where are my manners..! I didn't even introduce myself.] Please, call me Syl.