Can someone tell where to find this Ampere and Lovol? They don't appear on the monster girl wiki page
The capital. Ampere is the checkpoint girl durning the day, lovol is the one at night. To do the 3some event you need to have fooled around with Lovol in the arcade (she is there durning the day, and i think there are 2 events with her there?) and then go with Ampere to her place when her shift ends there is a chance the lovol pops up asking to join in