You decide that the slug-girl is actually pretty damn cute, and really, hasn't done anything threatening or aggressive. So why run? Maybe she's friendly!
The slug-girl slithers up to you and smiles. She stare intently at you, as if searching you for some quality, some attribute.
"Uh... hello?" you say.
Without a word, the slug-girl throws her arms around your waist and glomps onto your crotch.
See? I told you she was friendly.