The coolest thing about time travel actually wasn't seeing his mom and mentor when they were young. It wasn't finally getting to meet his dad- who was a colossal dick, thanks. It wasn't even seeing the legendary Gokuu Son alive and in person. The coolest thing about time travel for Trunks Briefs was the food. Food of any variety was scarce in his broken world. In the few cities not totally razed by the cyborgs, good food like fresh produce or meat was almost impossible to find. The rats got to a lot of it before humans could dig it out and what was left was usually spoiled or otherwise compromised.
Being the first time traveler ever recorded and managing to almost single-handedly save an entire reality had Trunks feeling pretty awesome… and pretty hungry. But hunger was something he'd gotten used to. Something he'd had to live with while training for, fighting or hiding from the cybernetic monsters of his time. Now that he had a respite- and plentiful, good food practically everywhere he looked- Trunks decided he had earned a break. Vegeta- it was hard to think of the man as his dad- had called a halt to their training and gone who-knows-where, so Trunks was left to his own devices in the sprawling, in-tact compound of Capsule Corporation.
His stomach reminded him he was on a mission and he easily found his way into the kitchen. It was dusk and the last rays of light filtered in through high windows. Trunks flipped the switch on the wall and fluorescent lights hummed to life. He wandered into the expansive room and began assembling items for a Saiyan-sized snack. It was nice that the plates, glasses and other utensils were kept in the same place in this time line. He put together several sandwiches, found a few 'Family Size' bags of chips and was just checking the pantry for some pickles when a noise caused him to pause. He held his breath for a few seconds, then heard it again. It sounded like a moan that was trying to be a scream but was cut off before it could get there.
Trunks stepped out of the storeroom and cautiously made his way into the living area of the complex. The strange noise was repeated and he could hear voices, but not what they were saying or to whom they belonged. He crept through the darkening house, his hand on the hilt of his sword. It was unlikely someone would break into Capsule Corps. and even more unlikely that the cyborgs would be here, but Trunks grew up in a war zone, constantly on guard and ready for anything. He treated the mysterious sounds the only way he knew- as though they were a threat. He stole into the east wing, where the Briefs family and guest bedrooms were located; stopping every few steps, listening, honing in on the sound. It was very close now, quite loud, and actually rising in volume and urgency. It was a woman's voice- his mom's! He still couldn't make out the other voice. It sounded like a man. Trunks considered turning back and minding his own business- his sandwiches were getting all room temperature- when his mother screamed.
Trunks didn't hesitate- he dashed down the hallway and kicked open the door to Bulma's bedroom. He was met with a sight that would stay with him for the rest of his life. The room was dimly lit but he could see his half naked mom sitting on her bed… with his mostly naked dad between her legs. Vegeta still had his gloves on.
Doesn't he ever take those off?, was the only thing Trunks could think as he backed out of the room and ran down the hall.