What is the least hurtful way to tell a girlfriend you might have slept with her niece?

Anonymous
No rude comments please.
In short, I have been sleeping with her niece. Because she is even more attractive than my girlfriend. (She is 4 years younger than me and my girlfriend) I know its "wrong" and "shallow" but thats all there is to it.
Obviously not going to tell before I know for fact the baby is mine.
What is the least hurtful way to tell a girlfriend you might have slept with her niece?
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