Yes, by her sister

Sam was interrupted by a knock at her door. “Sam, is everything okay in there? I heard some strange noises.”

Sam froze. She couldn’t say anything, or her sister would know something was wrong. On the other hand, if she stayed quiet, it was likely Sarah would think something was wrong then, too. There was always the chance that she’d take Sam’s silence as her being asleep, but that was unlikely.

After Sam’s prolonged silence, Sarah had had enough. “Alright, I’m coming in!”

Thinking quickly, Sam dove under her bed covers, only to realize that her large bulge was still visible the the sheets.

Sarah barged into the room, whatever she was going to say before dead on her lips. Her wide eyes stared at the pretty girl in her brother’s bed, then her round melons, and then her eyes stopped on Sam’s bulge. Knowing her virgin sister, Sam was willing to bet that this was the closest Sarah had ever been to a dick.

“Wh-who are you?” Sarah asked, though for some reason she was unable to take her eyes off Sam’s member. Said member had already soaked through the sheet with precum from both the session earlier and the arousal from being looked at.

Pleadingly, Sam said, “It’s me, your brother. I just woke up like this for some reason.”

Sarah momentarily looked up at Sam’s eyes, and Sam was caught off guard not by the doubt, but the arousal in Sarah’s eyes, as well as the slight blush on her cheeks. Their eye contact lasted for only a moment before Sarah looked back at Sam’s cock, though this time she took a small step forward.

“Sarah?” Sam asked nervously. She was unused to seeing her sister like this. She was usually calm and collected, always in control, despite still being a virgin at 21. Or maybe that was the reason why she was a virgin.

In response, Sarah took another step forward. Hesitantly looking up, she asked. “Ca-can I t-touch it, Sam?”

Sam, for her part, was completely caught off guard. Not only has her sister immediately accepted that Sam was now a futa, Sarah also wanted to touch her dick.

Sam probably would have said no, waited until she figured out what was going on with Sarah, but Sarah wasn’t waiting that long. She jumped onto the bed, frantically pulling off Sam’s sheets and grabbing hold of Sam’s cock.

“Pretty please?” If Sam wasn’t mistaken, it sounded like there was a little moan at the end of her question.

Sam groaned and leaned back into the pillows. Already on edge, it didn’t take long for her sister’s handjob to leave her in the throes of arousal.

Some time into the handjob, Sam felt something wet and warm envelop her dick. Peeking an eye down, Sam was shocked to see Sarah attempting to deep throat her cock. Emphasis on attempting.