Punch Up!

Architect Motoharu Maki is hanging out at the construction site ogling a particular hunky, well-toned construction worker when he is unexpectedly reunited with his lost cat, Shinobu. The reunion is all thanks to Kouta Ohki, a foul-mouthed young ironworker who found and cared for the lost cat. Unfortunately for Kouta, this act of kindness led to his eviction! When Motoharu agrees to take in young Kouta, will he be able to tame this feisty stray?

(Source: SuBLime)

Included one-shot:
Volume 1: Sweet♥Train