F Rank Shoukanshi, Pet Atsukaide Kawaigatteita Shoukanjuu ga Bahamut ni Seichou shita no de Bouken wo Yamete Saikyou no Ryuu Kishi ni naru is a Manga/Manhwa/Manhua in english language, ADVENTURE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

From the weakest summoner to the world’s greatest dragon knight! The adventurer Jay was mocked by those around him as the “Lizard Summoner.” Although he was a professional summoner, the only summon beast he could call forth was a small lizard, which led him to be despised. As a result, Jay couldn’t form a party with anyone and continued his adventure alone, cherishing his little lizard, Kucck. …But one day, suddenly Kucck grew into a huge and magnificent dragon – Bahamut! Seizing this opportunity, Jay began working as a carrier. Before long, rumors of the “Carrier Dragon Knight” spread throughout the royal capital, and everyone started to rely on him! From the mocked F-rank summoner to the world’s greatest dragon knight- A reverse unbeatable fantasy life kicks off!!