Bath scored five first-half tries en route to a comprehensive 38-10 victory over London Irish at the Madejski Stadium.
Bath’s third win of the season lifts them up to seventh in the Gallagher Premiership, leap-frogging above Irish who drop to ninth.
Obano got his side up and running with their opening try inside four minutes, the prop getting the final touch after a number of pick-and-goes a couple of metres out.
Rhys Priestland added the first of three successful conversions and Watson then showed his all-round footballing skills to score Bath’s second try minutes later.
A loose ball was smartly hacked upfield by the England winger, allowing him to slide over from a yard out and extend the visitors’ lead to 12 points.
Irish’s cause was not helped by a cast crippled by injury at an alarming rate. Paddy Jackson lasted just 12 minutes before succumbing to a hamstring problem, and Tom Fowlie failed his head injury assessment after coming on as a replacement.
A solitary penalty from the unusually quiet Stephen Myler was all Irish had to show for their first-half efforts, which were no match for a Bath back division which had it all their own way.
Rokoduguni added a third try with just over a quarter of the game gone, dotting down in the corner after skipper Priestland moved the ball wide from a mass of bodies under the posts, and the bonus-point try was not far behind.
A speculative punt into the Irish 22 by Rokoduguni was met by a dithering James Stokes – the full-back enduring a difficult debut following his move from Championship outfit Coventry in the week – and Homer pounced on the ball at the 28-year-old’s feet.
Referee Karl Dickson, in collaboration with TMO Sean Davey, did not have to consult long to come to their decision, with the Fiji number eight given 10 minutes in the sin-bin and Bath awarded a try.
Chudley then scored the pick of Bath’s tries as Irish threatened to completely unravel, with Jonathan Joseph instigating a wonderful, flowing move.
The England and Lions centre – a former London Irish player – was also at its conclusion, offloading out of the tackle to allow his scrum-half to scamper over unopposed for a fifth Bath try inside the opening half-hour.
The climax to a poor afternoon for Myler was capped soon after the re-start when an attempted cross-field kick was sliced.
It could not have bounced kinder for Homer, who went the full distance from just inside his own 22 to increase the visiting side’s lead further still.
Coleman’s effort was as much as Bath’s festive spirit was willing to yield and even after the away side lost Christian Judge to the sin-bin for a dangerous tackle, they kept Irish at arm’s length.
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