Ask for help with your "medical condition"

"Wait, Ellen, I need help with something."

"What?" She snapped.

You took out your pendulum, sensing that she wouldn't agree to your request otherwise.

"You know I have this medical condition, right? The one where I absolutely need help ejaculating otherwise I will faint and die. I can't do it myself and need another person to help me. You've done this many times in the past."

When Ellen recovered, she sat up, her annoyance changed to worry.

"Fuck. Sorry about that, I kinda forgot. Uh... how did... how do I do this?" She could remember helping, but not how. She was sure she was still a virgin, and you were her brother, so she was sure it didn't involve actual sex.

"Well, first, could you unbutton your shirt? I need to get into the mood."

Ellen looked shocked and blushed. Was this really normal? She followed your orders in a daze. Her skin was milky white, and a grey and black bra barely held back a gigantic set of tits.

"Wow, Ellen, your breasts are so big."

"Shut up! Can we just get this over with?"

You whip out your dick as told. Ellen's eyes widened at the erect, throbbing cock pointing right at her. She gingerly wrapped her fingers around the shaft and was surprised at how hard and hot it felt.

"Put some saliva in your hand, it's too dry without."

"Huh... okay..."

Her lubed up fingers began to stroke your cock, sending you into bliss. Ellen was staring intently at your cock while her cheeks were beet red, making her look even cuter than normal.

"Is this ok?"

"Yeah, it feels like heaven." Even though she wasn't experienced, her soft hands still made your body twitch with pleasure with every stroke.

"Are you going to cum soon?"

"No, not that soon. Maybe a few more minutes."

"Let me know, ok? I don't want it going everywhere."

She grabbed her phone with her free hand and began scrolling through her social media. She was fascinated by your cock but thought it was best not to let it show, since she was your sister. You didn't mind it. Just getting to stare at her cleavage while she jacked you off was an unattainable dream before gaining this power.

Before you knew it, the familiar pangs of an orgasm was rising through your genitals. You quickly signal to Ellen, who began to panic a little. She grabbed a bunch of tissues and aimed your cock at it just as the first jet let loose. Thick loads of cum shot out, and some of it dripped onto her thigh. Ellen gasped at how hot it felt on her skin.

She was left holding a big wad of slimy tissues and in disbelief at the amount of cum that came out of you. Blankly she went to clean up, but when she came back, she saw you standing naked by her bed, cock still throbbing with need.

"Wait, that wasn't enough?"