loli gal Honoka and I play a game of ejaculation endurance...!　but... (Pixiv Fanbox)

It feels good to be paizuri every day by two nieces as it is... but it is physically and ethically bad.... In order to get them to stop... I decided to play an ejaculation endurance game...! If I can endure for 10 minutes, she will stop...! Previous story　No.7 https://mohokuruko.fanbox.cc/posts/4966021