Your big sister has a big secret. She was born a Futa, but your Mom forbade her from ever doing anything sexual with it, she's never even been fully hard before. One day her curiosity got the better of her and she made the mistake of taking viagra to see what having an erection was actually like. What's a caring younger brother to do but show her the ropes and teach her how to make it go back down...
Scenario by u/ScriptsFromaSub and found here: https://www.reddit.com/r/gonewildaudio/comments/x97axv/f4m_your_futa_big_sis_took_a_viagra_script_offer/
Audio by u/TheInfinity_stoned and found here: https://www.reddit.com/r/gonewildaudio/comments/xk92fs/f4m_your_futa_big_sis_took_a_viagra_script_fill/