You try to but...

"Pull out, Craig," Samantha orders you but Erin's quivering pussy feels too good.

"FUUUUUUCK!" you groan as you spurt thick gobs of semen into Erin's convulsing pussy.

"Craig!" Samantha screams but it is too late. Erin seems to be too overwhelmed by her multiple orgasms to realize what you had done.

After your last spurt you pull out and only then you gain enough of your senses to understand the consequences of your actions -- as a lesbian Erin probably did not take birth control and you risk knocking her up.

"Sorry," you mutter, pushing yourself off of the blonde, who seems dazed by the pounding you gave her. You feel awkward that you had managed to pull out of Samantha earlier but not for Erin.

"Oh, Craig," Samantha sighs, looking down at her ex-girlfriend still bound and gagged. "I think we went to far. What are we going to do?"