Your aunt and mom’s husband has been cheating on them and they had recently found out about it. They decided to have an affair with you as a revenge plan

Tamako: Oh i love you so much dear…

Tamako is your mother and she was resting her head on your chest as she was sitting on your lap

Yuro: Me too…

Yuro is your aunt and she is also resting her head on your chest as she was sitting on your lap