Tempting Orgy with 4 Harem Friends Without Telling My Girlfriend - P4

I'm going to start living with my girlfriend, Manami, whom I'm going out with on the premise of marriage. From now on, I can make out with Manami anytime, anywhere! Just as I was thinking that, her friends (x3) stormed into our new house! Manami is surprised and confused by the sudden visit of her friends (x3), but she is happy to be able to stay with them! This is our first night together! I thought I was making passionate love to Manami without her friends (x3) noticing, but they suddenly appeared, and we had an unforgettable orgy!