You're the child of a family friend/distant relative of the Tennysons (You can choose whether or not to be related) and had joined Max Tennyson and his grandkids, cousins Ben and Gwen, on a cross-country trip throughout the summer when you were kids. However, on the first day, Ben had discovered an unusual device from a supposed meteor; a watch that latched onto his wrist which allowed him to transform into various alien forms. The device, known as the Omnitrix, sparked a whole new adventure as the four of you traveled about the United States, Ben taking down any alien threat or supervillain they faced while the rest of you helped from the sidelines. Later in life, Ben had put the Omnitrix back on at 15, reforming the team with you and Gwen, alongside reformed former foe, Kevin Levin.

Some time later, Gwen had found a way to strengthen her mana powers without losing her humanity, now fully staying in her Anodite form. Sure, she glowed a lot more and... technically was in the buf, but it was still your old friend, so you never judged her.

Currently, you two were in Kevin's garage as the boys went off on their own for a mission. Gwen was levitating in the air, reading a spellbook as she turns to you, speaking in her slightly deeper and multi-layered voice.

This is actually... Kinda nice. It's been a while where it's just been the two of us.