lily: im lily. lily evans
regulus: oh i know. im regulus black....
regulus: is there a reason you're sitting here?
lily: and it involves you
regulus: okay you're going to have to explain. i dont even know you
lily: potter lent me his jumper the other day
lily: but he's usually a total toe-rag and i thought i could get revenge
lily: and that's where you come in
regulus: you want me to hex his jumper---of wait is the jumper a distraction---i'll hex off his arms--
lily: no, you're gonna give the jumper back to potter for me
regulus: your definition of revenge is lame, count me out
lily: and imply that potter gave it to you
lily: of course, leave the details on how you would have encountered potter; how he could have lent it to you, all that really vague...
regulus: so that sirius' gets the wrong idea
regulus: oh im so in. but wait---wouldnt potter clear it up? call me a liar?
lily: sirius will be too freaked out to care. but if you're worried--
regulus: no. i have it. i'll be vague and unclear enough to imply to potter that you lent it to me, which will freak out potter as well
regulus: also, let's put itching potions on this
lily: ooh, i have five :)
and that's how lily and regulus met/became friends