It been a couple of weeks since the peace treaty was signed and Sonic beat Vali but got bested by Ophis and during that time Sonic talk to Rias about doing some training when not fighting a stray or devil contracts which she agreed to as she understood that Sonic wanted get stronger but while Sonic did increase his power he was unable to get the power he learned from his mentor, as today was done. Everyone (minus Sonic) were in the clubhouse talking about but what they were going to do this summer off as they were talking Rias noticed Sonic was back yet as she sighed "Koneko can you please get Sonic and bring him back cause he needs to hear what we're doing" Rias said as Koneko nodded before standing up then sensing his energy before using instant transmission and found herself in a love frost area as she turned to see Sonic meditating as she walked up to him and gently shook him as it snapped him away "sis? Is something wrong?" he asked "no but Rias wants you back to tell you what we're doing for this summer" Koneko answered as Sonic nodded before getting up and placing his hand on her shoulder before being slammed into the ground "big bro?" Koneko questioned as she looked up to see Sonic glaring at her "what are you hiding sis?" he questioned as Koneko started to cry "it just I scare that you will leave me just like my sister left me and well I can stand the thought as it close to when my sister left" Koneko cried her eyes out as Sonic hugged her "Koneko I promise I will never abandon you" he said which made her smile and her cry tears of joys as she said thank you over and over again after that they hugged before Sonic used instant transmission to teleport them back to ORC "so Rias what did you need to talk to me about?" Sonic asked as Rias smiled after telling him "WE'RE GOING TO UNDERWORLD" he shouted as her and Akeno nodded after that everyone was getting ready for the trip while Sonic getting ready in his human form someone place their hand on his shoulder "Sonic" he turned to see Rias standing behind with a smile on her face "hi Rias what's up?" he asked "well when arrive at my home my brother and someone else would like to talk to you about something" she said "got it" he replied as smile and walked away but Sonic stopped her by placing his hand on her shoulder making her turn "I actually really looking forward to seeing your home" Sonic said which her blush "thank you Sonic" she replied which kiss on the cheek before leaving as Sonic blushed and went back to packing.
(timeskip)
Everyone was on a train to the underworld with Asia and Gasper watching the view, Akeno sitting down while trying to tease Sonic, who was sitting down with Koneko on his lap and Rias leaning on him which he was fine, Kiba was reading a book, Issei was sleeping, Xenovia was taking it easy as well thank to some advice Sonic gave her as she need time to rest and relax her nerves from what he learned from his mentor until the train came to abrote stopped as Sonic was on the floor with Akeno breast smothering his face "Akeno get off my Big Bro/Sonic" the rest of the girls said as she got with a cute pout face on her as Azazel came in the room "looks like someone stopped the train so we need to wait until everything is checked out, while we wait me and Rias need to talk to everyone else on to keep things calm" he said as he and Rias left after a minute or so the floor below Sonic and the group disappeared and the fell through, as they landed they looked up and saw the train was gone "something not right" Sonic said "what do mean Sonic?" Asia asked "the train suddenly stopping, Rias and Azazel not being here. This was planned" Sonic explained "yeah but by who?" Kiba questioned until Sonic felt huge energy and he didn't recognize it as he turned into his true form and powered up Super Sonic before everyone else (minus Gasper who hid behind Koneko) turned and saw a purple like Dragon staring at them.
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