Honeymoon NTR: The worst presents my best friend gave me~

I, Rin and Kazuma, who have been with me since I was little. Today I'm on a hot spring trip that Kazuma gave me as a present for me and Rin. Kazuma laughed, saying that his childhood friend was a drama about getting married, and stamped a seal in the witness section of his marriage registration. That night, the three of us were drinking together while talking about old times, and the lounge was approaching opening hours, so I left first and headed to the hot springs. When I got out of the hot spring, Rin, who was supposed to be in my room, was not there, so I was worried, so I contacted Kazuma...