MKON-009 - My sister who loves me too much, gets taken by my boss for my sake

My sister Aoi is obsessed with me, constantly trying to seduce me every chance she gets. I'm struggling to keep my hands off her, but when my boss visits and discovers our secret, he forces himself onto her. Watching my sister submit to him right in front of me, all for my sake, is a twisted mix of pleasure and guilt.