Try using a dildo for a few days prior to you date so, you stretch yourself. Then have her enter you slowly until all the way in. Once all the way in she can pound away 'till she cums. You'll love the feeling of her exploding inside you and filling you up with hot cum. Good luck. Have your male lover lick your asshole for a while and then tongue fuck you deep. He'll be lubricating you and then he'll insert a finger, then two, stretching you butthole for his cock.