No.
Belldandy would have to control her urges. After all, she couldn't act out her urges every time they came up. Even though Belldandy wanted to have sex with Megumi right here and now, she managed to control her sexual urges. First off, what would Keiichi say if she she did that to his own sister?! No. Belldandy would have to wait until Keiichi came back to act out her urges.
"So, who did you sleep with?" asked Urd, coming back in the room. Belldandy's sexual urges only increased when Urd entered the room. Again, Belldandy managed to control her urges.
"Oh...with a guy I knew from grade school" said Megumi, her cheeks were VERY rosy. "but I used the pill..so I didn't get pregnant"
"How can a pill stop you from getting pregnant?" asked Belldandy. Megumi fell anime style and Urd sweatdropped. Belldandy must be the goddess of navie people.
"Well...it makes the body thinks that it's already pregnant" said Megumi. "so, it prevents you from becoming pregnant"
"Why did you not want to get pregnant?" asked Belldandy.
"Is she for real?!" asked Megumi to Urd.
"Sadly, yes" said Urd.
"Well, it takes money to take care of a baby" said Megumi. "and my parents would skin me alive if they found out I was pregnant!"
"Oh..." said Belldandy.
Urd found it was interesting that Megumi wasn't a virgin anymore, like her brother was now. Who knew that Megumi would sleep with a guy.
"Please excuse me" said Belldandy. "I have to wash the dishes now" and she collected all the dirty plates on the table and walked out of the room.
"So how's come it wasn't a threesome with you guys?" asked Megumi.
"Keiichi is learning about sex" said Urd. "he hasn't got your...imangination yet. Why, were you in a threesome?"
Megumi blushed bright red and Urd had to stop herself from laughing at the look on Megumi's face.