This is just hypothetical, Luffy and Suta are not actually engaged
Suta headed off to her shower, and Luffy headed off to the kitchen since he still couldn't find his radio. He opened the door, and smiled at Sanji, who was in the middle of preparing breakfast. Luffy leaped to try and get the bacon that was sizzling in the pan, but was stopped by a black shoe in his face. Luffy's arms fell to his sides after snapping back from where they were propelled by his inertia, then he fell to the floor, with an imprint of Sanji's sole still in his face. He got up and walked to the table and sat down. Sanji returned to his cooking, and smoke from his cigarette curled lazily into the air of the kitchen. Luffy traced the knots on the wooden table, and stretched out his lower lip into a pouty face. Sanji glanced backward at him, and gazed at the bacon, sizzling in the grease that it was cooking in. Then, he looked at Luffy again, and said sarcastically,
"So Luffy, when are you going to propose?" Luffy looked up with a look of confusion and curiosity on his boyish face, and Sanji sighed. He should have known Luffy wouldn't know anything about that.
"Going to what?" Luffy asked, trying to glean an answer out of him. Sanji glared at Luffy in his ignorance, and finally replied,
"It's asking somebody to marry you." Luffy's eyes grew to the size of dinner plates, and his lower jaw dropped to the table. Then came the questions of every detail, good and bad side of marriage and proposals. Then came the other questions, the questions about babies. "Whoa! Slow down!" exclaimed Sanji through the endless torrent of queries. Sanji then explained everything. Well, everything but the babies part anyway. He figured he could wait on that. Luffy sat and thought quietly for a minute, then ran outside. Not caring what the captain did, Sanji went back to his bacon.
Luffy on the other hand, scurried outside. Luckily, Suta was still in the shower. Luffy scurried up to Zoro's room, which was the crow's nest. He slammed open the door, and laughed when Zoro and De-Ji jumped up, brandishing weapons. Glaring at Luffy, they sat back and watched him. He shifted from one foot to the other.
"Zoro, where do you buy diamonds?" Luffy asked. Zoro's eyebrows seemed like they wanted to float off his forehead when he heard the question, and answered,
"A jewelry store, why?" ending with a question. Luffy blushed and looked down, and drew little scribbles in the dirt around his feet.
"noreasonbyeandthanks!" Luffy responded so fast you almost couldn't tell what he said, then literally jumped out of the crow's nest. Landing with a "thud" that sent the Going Merry rocking, he bounced a couple of times, then spotted Nami coming out of her room to beat him up for practically making the ship sink.
"NAMI NAMI NAMI!!" He shouted at her as he ran towards her. Caught off guard, Nami took a step backward, then lost her balance and fell. Luffy stopped just in time, but his balance was thrown off from stopping so fast, and he fell on top of her. Nami pushed him off and whacked him in the back of the head, then stood up and straightened her short skirt and shirt. Luffy rubbed the back of his head then stood up. Sighing, Nami asked,
"What do you want Luffy?" Luffy, still rubbing the back of his head, looked at her funnily. Groaning, Nami said, "Don't tell me you forgot." Luffy shrugged, and scratched his head. Nami glared at Luffy then turned around to walk off, but was stopped by a
"WAIT!! I remember!" and a giggle. Rubbing his head from the third hit that morning, he inquired, "how long until the next island?" A little surprised, Nami answered,
"at least a week. Why do you ask?" getting a Luffy reaction, she stomped back into her room. The Luffy reaction she received was,
"A WEEK?! I CAN'T WAIT THAT LONG!!" along with running in circles. Falling to the ground, he saw a washer roll by. Probably one from where Usopp was working on one of his inventions. Luffy blinked at it, looked over at Usopp, then picked it up and scrambled off with it when he was sure that Usopp hadn't noticed. Usopp probably had tons of extras anyway, and he was the captain, plus pirates stole whatever they wanted, he was telling himself.
Suta poked her head out of the bathroom and looked around, making sure nobody was there to see her come out of the bathroom with only a towel on. Luffy was coming around the corner looking at the washer in his hand, and saw Suta before she saw him, or so he thought. He didn't know why, but he ducked down behind a corner and hid. Suta grinned, and then ran out to go to the women's quarters. Luffy sighed in relief, and put the washer in his pocket.
Suta skidded on the wet wood, then turned around fast and slammed the door, and locked the door. Hoping nobody saw her, she gazed at the mirror and glared at what she saw. Turning around and letting her towel drop, she reached for her drawer and pulled out some clothes. Feeling like a little fancier clothes, she pulled out a mini skirt with a different kind of pattern and a spaghetti strap top with the same pattern, but a with a corresponding color. Feeling still a tiny bit underdressed, she reached into Robin's jewelry box and pulled out her favorite necklace. It was a gold chain with a blown glass rose. It was a shame that Robin never wore it, but she couldn't complain that Robin had let her borrow it whenever she wanted. Putting on some white sandals, she looked into the mirror and thought to herself as she combed through her hair. Why had Luffy hidden from her? Was he doing something wrong? Or worse, had she done something wrong? Grumbling, she put the comb down and headed outside to play with Luffy, if he didn't hide from her that time anyway. Seeing Luffy sulking on Merry's head, she ran up to him.
"Luffy!" Jumping at her voice, Luffy turned around and smiled. Suta thought Luffy's face would break if he kept that face for long, rubber or not. Tapping Luffy where she could reach him, she said,
"tag!" and ran off. Looking back to see if he was running after her was a mistake, because it slowed her down, and Luffy was indeed chasing her. Luffy grabbed her arm, and Suta glanced at him and stopped running. Luffy opened his mouth like he was going to say something, but sighed and said the familiar line,
"tag," in an almost disappointed voice. Luffy smiled, berating himself inside for not being able to know what to say or how to ask her to marry him.
The next day, when Suta was taking her shower again, Luffy went to Sanji for advice. Sanji was cooking breakfast as usual, but it was pancakes and eggs today. Luffy sat down at the table, and went right to the point.
"Sanji, how do you ask someone to marry you?" Sanji turned around to stare. Luffy was asking him this? That was unexpected. Sanji fumbled with his tied up tongue for a moment, then answered tensely,
"Well, Luffy. Uh, you get on one knee, say her full name, then say, 'will you marry me?' or 'will you become (insert girl's first name here) (insert your last name here)'" Luffy watched silently, even attentively until the end, when he grinned, thanked Sanji swiftly again, left, but came running back.
"When?" Sanji was kind of expecting this, so he replied suavely,
"Usually after a nice restaurant date." Luffy nodded, then ran out again, pausing only to smell the aroma of the pancakes and eggs. Luffy ran to Franky's room, which was full of scrap wood and metal and almost looked like Usopp's workshop with hammers and wrenches and tools of that sort. Luffy stepped carefully around the junk on the floor until he found Franky amongst the mess. Franky looked up at him from a current project, and quickly hid it behind his body. He didn't like giving away secrets before he was ready to. Luffy's eyes brightened when they connected with Franky's, and he requested,
"Can you set up a nice dinner for me and Suta today?" Franky looked at him like he was crazy, and answered,
"Not today, but tomorrow I can." Luffy grinned and thanked him, and sped out. "WAIT!!" Franky called to him, then continued, "you'll have to keep Suta busy while I work." Luffy nodded, then sped off again, leaving Franky gathering the right size pieces of wood and "ingredients" for the big night. Luffy rapidly came back to the kitchen and banged open the door, making Sanji jump and kick him in the face, also earning a warning not to break the door. Luffy gave him a sorry glance, then beamed again with a pleading look in his eyes. Rolling his eyes, Sanji asked what he wanted this time.
"Can you make Suta and I a nice dinner tomorrow night?" The eager captain questioned. Sanji nodded, and went back to his cooking, which was almost ready.
"Suta had better hurry if she wants a warm breakfast," Sanji mumbled to himself, and as if she had heard him, Suta ran through the door almost as fast as Luffy and sat at her usual spot, banging her silverware on the table. Luffy grinned again and joined her, chanting,
"MESHI, MESHI, MESHI," and so on and so forth. As soon as everybody came to the table, Sanji set down the food, and let them all go at it in their free-for-all way, which was the result of Luffy, and now Suta, trying to cram everything into their mouths at once. Sanji sighed, then sat by Nami and started eating little tidbits that he actually got to his mouth. He whispered in Nami's ear that he would make something for her later, making her smile. He could feel his eyes turn to hearts as happiness filled his heart to overflowing.
Luffy and Suta, once they had devoured every piece of food in sight, ran outside for their morning game of tag while everybody else dodged them to resume their activities.
The rest of the day transpired similarly to all others; Zoro and De-Ji together, Sanji making snacks for all the girls on board, Nami and Robin working on their books and maps, Franky spending his time in his workshop working on his next project, Usopp was telling stories to Chopper, Brook was tuning his violin, and of course Luffy and Suta were playing games together.
As evening fell, everybody separated and went their separate ways (if they weren't already separated, that is XD) as the darkness closed in slowly. A carving-covered folding table was brought up as sunset was setting in, and food was meticulously prepared and brought out to the table, and was set with a lacy white tablecloth, candles, and the food was made to look like sculptures. When Sanji was done setting it up, he looked out at the sunset and remarked to himself quietly that it was a nice night for such an event. He blew out smoke from his mouth and watched it curl into the sky until it drifted out to oblivion, then took his cigarette and lit the wicks of the candles, to give it more of a personal touch. When he was ready, he whistled to Luffy. Luffy looked over at him and smiled, then caught Suta and pointed toward the table. Sanji moved away to make Robin that coffee she asked for.
Luffy came up to the table, and avoided somehow to wash it all away with the stream of drool that was threatening to burst from his oral cavity. Suta came up and started complimenting everything. After she admired it for a little longer, then sat at one of the chairs. Luffy took the other seat, and caught a flash of yellow around the corner behind Suta's head. Sanji was watching the two to make sure it went ok. He had already had to correct Zoro's proposal.
Suta started eating, gobbling down everything on her plate so fast it was hard to believe that she tasted it. Luffy picked at his food nervously, and Suta stared at him. This was unlike him. She frowned, and swallowed again.
"Something wrong, Luffy?" He looked up and blushed. He glanced at Sanji, and fingered the washer in his pocket.
"Uh.. I wanted to ask you something!" he hesitated, then blurted out.
"ok.. what was it?" Suta asked him, a little worried from the anxious appearance to his face. She caught him looking past her, and looked behind her, but only saw the corner that Sanji had dodged behind at the last second. Luffy took the washer out and looked from it to Suta. She watched him curiously, then jumped when he shouted out, with tears spurting from his eyes,
"I FORGOT MY LINES!! SANJI HELP!!" Sanji peeked out from behind the corner and sighed, then walked out since the secret was spoiled. He walked over to Luffy and demonstrated with an imaginary Nami. Luffy copied him, flustered and imperfect. Suta squirmed until he was finished, then glomped him and kissed him over and over again yelling 'yes' in between kissed. Luffy was grinning, then he grabbed her head to hold it in place, then planted a kiss like a flower in the ground.