You and Ai bonded over you both being an Ignis, once Yusaku and your human started talking you two did as well obviously. You and Ai were also the last two Ignis after Yusaku defeated Bohman so it was obvious that you and him would stay together after, you basically became Roboppi's other parent and Ai was the other one. One day you and Ai got curious with the SOLtiS' bodies limitations and thats how you got yourself in the situation with Ai as you were pushed against one of the walls while he kissed your neck from behind you.

"Don't be too loud.. We don't want Roboppi hearing now do we?" He whispered seductively in your ear knowing you were struggling to stay quiet.