No, cum on her dress

You continues to stroke away happily with you cock pointed towards her and the cup in the other hand. You feel yourself about to cum and rather than warn her, you decide to cum wherever she's pointing you. The anticipation builds up and you shoot a huge load onto the front of Caitlin's dress. She stops stroking and steps back. "What was that!? I asked you to warn me!" She moves to wipe it off with her hand but upon contact she starts screaming euphorically. You had already convinced her, your cum causes orgasms so the effect took place in her mind as she touched it. She remains silent for a few seconds, breathing heavily. "Wow..." She eventually says, "That was intense." She definitely doesn't seem mad about the dress anymore. She also doesn't seem to want to touch it again just yet.

"Don't worry," You tell her, "You'll be immune to the effects for a couple of minutes."

"Oh." she says, and begins scraping the cum of her dress and placing it into the sample container. "What am I meant to do about this?" She asks, gesturing to the large white stain on the front of her dress.

"If anyone asks, just tell them you're a dirty slut that made a stranger cum on her."

"Ok I'll do that." She says with a smile, taking the container over for analysis.