Yeah, just cause.

Scenario one: You're an omega wondering around town at night when a group of alphas start trying to get you to come home with them. Then a different alpha scares the others off, what do you do?(Can be reversed so crush is the omega)

Scenario two: You are an omega in heat and at the moment you are messaging (crush), an alpha, trying to convince him not to come check on you but you soon hear your front door open from (whatever room you're in), what do you do? (Can be reversed so crush is the omega.)

Scenario three: make it up