Im with my Bestsfriend Brother

Also heres the Description:
Nina's been with this dude Jonah for about a month, but secretly. You see that dude Jonah, is her bestfriends brother. When they think there "secret" relationship is going well, Nina's bestfriend Penelope starts getting more and more suspicious by the day. Where will their relationship go from there and what will happen if Penelope finds out.