Bluff

You lower your hands but take a step back and try to look non-threatening - not that she looks remotely threatened, but to give the appearance of someone trying not to scare her. "I wanted to surprise her. We've both been so busy the last couple weeks and, well, it's a little embarrassing. Last time we were... together," you glance down at the lasso, "we discovered she likes being tied up, and she wanted to, err, explore that some more." You shrug, doing your best to look slightly uncomfortable.

Donna raises a skeptical eyebrow, so you continue, “It’s true, I swear to God…no, I’ll do better than that!” You gesture down at the lasso. "She had me swear on her rope thing, said it's sacred to her family?" You set one hand on the lasso and raise your other like you're in court. "I swear everything I just said is true." You feel the familiar tingle from the lasso and hold your breath; but everything you said was literally true, and you'd already established that the lasso is a literalist, so it doesn't object to your selective editing.

Donna's posture relaxes visibly and she shakes her head, a strange expression on her face. "Dammit Diana, I wish you'd talk to me about these things."

“Heh, I’ve got an older brother who’s the same; like I’m still this little kid he has to protect from the truth.”

She looks up at you, and while her expression doesn’t change you get the sense she’s seeing you as an actual person rather than just a potential threat. "Yeah, I hear you.” She nods towards the living room. “OK. You can see yourself out.” Not a question.

"Totally, totally. I'll get out of your hair. I'm so sorry I woke you!" You start to move towards the doorway but bump into the chair, knocking her costume and lasso onto the floor. “Sorry, sorry, not at my best tonight!” you say as you bend over to pick them up, and stand back up holding up her red bodysuit. "Oh you do cosplay? Cool cool. This is... Supergirl, right?"

Donna Troy stares at you like you're God's Own Special Idiot, and then starts laughing out loud at the absurdity of the situation. You start laughing too and that only makes her laugh harder. It only lasts a few moments, but if you didn’t know better you’d say the two of you were having a moment.

"Hey it’s almost morning anyway,” you say when the laughing subsides. “How about I cook you breakfast by way of apology? I make a mean frittata.”

Donna gives a dismissive handwave, “No that's nice of you to offer, but..."

You raise your eyebrows and give her a significant look. "We can swap embarrassing stories about Diana?"

Donna stops and nods her head side to side, thinking about it.

“Lemme get dressed.”