She is probably on her period.
But if alcohol is not an option, then just play it cool. Don't bring up the topic of sex. Don't seem too eager when you guys kiss/make out. But keep the mini make out sessions persistent (every 7-10 minutes or so), and feel her ass/tits up while you are doing so. Then stop it, and go back to whatever you guys were doing. Pick up where you left off, and act as if nothing happened.
What you are trying to do here is get her horny, but without being over aggressive. This hot/cold technique will work if implemented correctly. But they differences between the two should be increasing each time - the mini-hook ups hotter, the mini-freeze outs colder. During your 4 hook up, get aggressive and try to either feel her up under her bra, or rub her pussy over her pants. Gauge her reaction to this, and calibrate accordingly. If she is digging it, try to get your hand down her pants next time, and take your dick out of your pants and guide her hands to it. If not, back off and slowly build up the sexual tension again.
But if alcohol is not an option, then just play it cool. Don't bring up the topic of sex. Don't seem too eager when you guys kiss/make out. But keep the mini make out sessions persistent (every 7-10 minutes or so), and feel her ass/tits up while you are doing so. Then stop it, and go back to whatever you guys were doing. Pick up where you left off, and act as if nothing happened.
What you are trying to do here is get her horny, but without being over aggressive. This hot/cold technique will work if implemented correctly. But they differences between the two should be increasing each time - the mini-hook ups hotter, the mini-freeze outs colder. During your 4 hook up, get aggressive and try to either feel her up under her bra, or rub her pussy over her pants. Gauge her reaction to this, and calibrate accordingly. If she is digging it, try to get your hand down her pants next time, and take your dick out of your pants and guide her hands to it. If not, back off and slowly build up the sexual tension again.