Go to the bathroom.

You decide that you don't want to risk a morning surprise for your sister. You get out of bed and quietly exit the room, closing the door behind you. You noticed that the bathroom light was on, so you waited patiently.

Eventually the bathroom door opened and Joel came out, wearing only his boxer shorts. He gave you a goofy grin as he passed and went to your bedroom.

As you were about to go in the bathroom, Jessica came out after Joel. She was wearing only her panties, her soft white breasts gleaming from the light beside her. She gave you the slightest smirk.

"Oh, didn't think you were awake. You weren't trying to spy on us were you...?" She asked.

You shook your head dumbly.

"That's a shame. We had a lot of fun." Jessica's gaze drifted over your shoulder and towards the guest bedroom.

"Well... Go on ahead and go to the bathroom." She said. There was a hint of mischief in her voice.

"Yes, okay." You said dully as you stepped past your wife and into the bathroom.

You emptied your bladder for a minute and flushed the toilet. You turned the light off and closed the door behind you.

As you approached the guest bedroom quietly, you heard murmurs behind the closed door. You listened.

"... while he is asleep. Do you understand?" You heard your wife speak almost seductively.

"...But he is my brother." You heard Cait reply in a small voice.

"Yes, someone you love dearly hm? Someone you trust." Jessica continued.

"...Yes... That's right." Cait said.

"Good girl." You heard your wife's footsteps towards the door, and you immediately retraced your own down the hallway, so it'd seem like you only just arrived.

You walked up as Jessica exited the room. She looked over at you and smirked. She still had no top on, and you couldn't help but stare at her perfect, perky tits.

She walked past you and murmured. "Have a good sleep..."

You entered the room and quietly closed the door behind you before creeping up to the bed and climbing in. You laid there, staring at the black ceiling. Cait didn't make a sound, so you assumed she had already fallen asleep.

You rolled onto your side and closed your eyes, however the trip to the bathroom woke your mind up and you found yourself mindlessly thinking for almost half an hour before you eventually felt a little sleepy and your dreams began to emerge.

You dreamed of Jessica's soft tits squeezing together onto your hard cock. You looked down at her pretty face and mouth which was urgently slurping on the head of your member. You ran your fingers through her hair as her saliva coated your cock and she began to pump up and down with her tits. You moaned softly. "Jessica..." She looked up at you with a pretty face, but it wasn't her own. You stared as her features slowly changed. Her hair lightened and her face softened. You gasped when her face took the form of your sister. Cait rolled her tongue slowly around the tip of your dick as she stared up at you seductively. You'd never imagined an image of her being so slutty.

"Do you like it?" She asked with a husky voice.

"Y-yes..." You weakly responded. You hated yourself for it, but it was a dream... So might as well enjoy it.

She moved back a bit so that your cock was no longer squeezed between her tits. She ran her fingers over the shaft and gently took a hold before stroking it up and down. She stared at your cock hungrily and in a daze while playing with it. Cait flicked her hair back and lowered her mouth around the tip again. You felt her tongue flick over your cock hole as she fondled your family jewels slowly. You felt them tighten as a familiar rush washed over you.

"I'm cumming..." You groaned.

"Do it..." She said, her sucking becoming more aggressive. You watched as Cait's mouth devoured your cock, and you felt the tip hit the back of her throat. She gagged on your cum as you shot it down her throat. You watched her swallow hard then gasp for air. She licked her lips and looked up at you. "No telling..." She said.

"Yes..." You agreed.

You once again got lost in your dreams, and before you knew it, you awakened in the bedroom, alone. You sleepily climbed out and felt a wetness against your legs. You gasped as you saw a familiar sticky substance on the sheets. There wasn't a lot of it, but your dream must have made you cum a little bit. You swore as you began to wonder whether Cait had noticed. Thankfully it wasn't on her side of the bed.

You got out of bed and got dressed, then headed into the loungeroom. It was just Cait and Amanda sitting at the dining table.

"Good morning!" Your mother greeted you with a smile.

"Excuse me a moment." She said as she stood up and walked past you, then to the bathroom. You sheepishly walked into the kitchen, your gaze watching Cait from the corner of your eye. She didn't seem any different. She was reading the news paper while eating cereal.

You wondered whether you should talk to her directly and see if she noticed it or not.