This kind of weakness absolutely prevents you from or forces you into doing certain things. Some vampires cannot enter a dwelling unless invited inside, devils cannot go onto holy ground and few succubi can seduce virgins. It is absolutely impossible for you to break this geas on your own, but if forced to break it (a succubus raped by a virgin) the geas is broken. If you are fooled into breaking your geas, you lose the use of all your Chi powers and take a Wound Point each Sequence until you has somehow atoned, which may be very difficult to do in such a limited time.