It was Tigra

You opened the door to see Greer Grant on the other side. "Hello." "Hi." you say back to her. "May I come in?" she asked you. "Sure." you then move out of the way so she can enter your room. She then makes herself comfy on a nearby chair. You sit back down on the bed. "So what can I do for you?" "Oh, I just wanted to chat for a little bit." she says as she stretches her arms. "I guess your an Avenger now." "Yeah, it's awesome. I can't wait to go fight some villains." You say excitedly. "So about your powers..." "Hm?" "...How did you get them?" She questions you. "Well, I was at work when I patted my coworker on the back after getting my work done, a menu popped up with different options on it. Curious I tapped on one of the options and accidentally turned my coworker into a dog." She then laughs causing you to blush at her cute laugh. "Anyway, I quickly reverted the changes and apologized." You told her as she listened. You then thought to yourself. 'Should I tell her how I wound up here? Ah, fuck it.' You then looked at her. "Greer...I need to be honest with you." "Oh?" she said curiously. "I'm not actually from this universe. You see, I'm from a different universe where I'm the only person that has superpowers. I was teleported here after getting sucked in through a portal and with the portal gone, I can't get back to my universe." "Hm, I'm sorry to hear that. I'm also sorry to say that we don't have the technology to transport you back home." Hearing this saddened you a bit knowing you won't get to see your family again. She then cleared her throat causing you to look over at her. "Anyway, the reason I came here is..." she then nervously rubbed her arm. "Is what?" "I want you to use your power on me." What she just said stunned you. In your universe no one wanted you to use your power on them but here is an attractive woman who wants you to use your power on her. "Wait really?" You say in shock. "Yeah, after witnessing your power, I wanted you to try it on me." "Oh, well alright then." You say as she moves and sits beside you. "Well, do you want to grow, be transformed or both?" You asked her causing her to pause for a moment. She then thinks on what she wants before making up her mind. "I choose..."