Because I also want to have fun, here's a little follow-up to >>617 . Do not make it stop you from posting your own.
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You're watching your little sister, her eyes crying as she's literally begging for you to help her. Few people could resist this, and you're clearly not the kind who can resist something. Especially not from someone as close as her. Yet you couldn't resist throwing a witty remark to change the mood a little.
"…I think I need an adult right now."
"But I am an adult, Onii-chan."
You can't help but laugh sincerely, completely unexpecting her answer. She seems surprised, her tears stopped flowing as she watches you with curiosity, wanting to understand what was so funny.
"Yeah, right, you're an adult. Thus allow me to treat you as such."
To her surprise, you get rid of the ties binding you and hug her.
"You know the consequences of doing this, right ?"
"Yeah."
"You know you could never be able to show yourself as a couple with the one you love, right ?"
"Yeah."
"You know any people wanting to hurt us will be able to do so with even more ease than any normal couple, right ?"
"I expect that to happen."
"You know we can't marry, or have our own children due to the risks related to that, right ?"
"I already can't have any, due to my goddess lineage. And I don't care for marriage as long as I can stay by your side."
"…You know I'm probably gonna become older and die before you, right ?"
"…I know. I'll find some way to change that."
"You really have an answer for everything, right ?"
"I can't help it. That's because I love you, Onii-chan."
Her smiles strikes through your heart. She won, on every field, and you can't resist her anymore, beginning to kiss her as you pull her towards you.
However, things didn't end as good as planned.
Nepgear is a goddess in every sense of the term, including her strength. A strength she can't control during tense moments, including that one.
You died during the act, due to the peer pressure of her inner walls making your dick explode.
BAD END.