It might have happened this way...
1. Boyfriend is coming over. Horny milf is excited.
2. "Damn...where's my birth control?"
3. She never found it, but things got exciting anyway.
4. Yes, there was intercourse.
5. And the boyfriend lost control and came deep inside her.
6. Afterwards she took a shower.
7."Hmmm...will a shower be enough?"
8. She sleeps on it. Meanwhile something is happening inside her.
9. Her breasts are changing...
10. Shit!
The moral is: better to be prepared BEFORE than to be sorry AFTER!