Ace paceman Joe Grant ensured that Dunnington continued to set the pace in division one of Costcutter York and District Senior League when he blasted Sessay's batsmen with 8-57.
Only Matthew Till (25) and youngster Nick Harrison (29) produced any batting form as Sessay were dismissed for 109.
Another Sessay youngster Steve Langstaff then took 4-36, but Dunnington were able to gain the rewards with four wickets in hand to lead the division by 14 points and leave their opponents in deep relegation trouble in 11th place.
A stunning piece of bowling by Andy Gray saw second placed Wilberfoss maintain their strong promotion bid with a 96 run win over the unpredictable Duncombe Park side.
Gray made 50 and Geoff Room 43 in a tantalising Wilberfoss score of 153-8 with Andrew Pierson claiming 4-36 for Park.
Former Bilton bowler Nick Webster then started the Duncombe Park rot with 3-15 but Gray was the ultimate destroyer when, in just five overs and three balls he captured five wickets for one run.
His effort reduced the Helmsley side to 57 all out as he joined the small ranks of players, who have taken five wickets and scored a half century in the same game.
Beverley Town recorded their first victory of the season when they inflicted a heavy nine wicket beating on Stamford Bridge to ease their relegation fears.
Sean Lightowler was Beverley's most successful bowler with 3-33, while Mark Owens 36 and Steve Wilson 39 were the principal contributors to Stamford's 131 all out.
Beverley lost an early wicket but then coasted to a nine wicket win as Andy Burton was unbeaten on 68 and Ali Brumfield was 44 not out.
Goole Town's fortunes have nose-dived since being the only side to beat Dunnington and their fifth defeat, suffered at Ripon, has seen them plummet into tenth place, a mere 12 points ahead of the relegation zone.
Batting first Goole found Paul Mason in an uncharitable mood as he took 3-37 but were able to make 141-8 thanks to 39 from Steve Foster and Kevin Murphy's unbeaten 25.
It was soon evident that this was an inadequate target as Nick Jackson made 56 and Tim Collins 44no and Ripon moved into third place with a seven wicket victory.
Bottom-placed Civil Service pulled off a shock win over Crayke to record their first victory of the season.
However, they remain 35 points adrift at the foot of the section and will need to string a number of good results together if they are to avoid relegation.
Batting first, Crayke were utterly destroyed by Rees Houghton who captured 5-15 and Dave Nmather whose 4-37 helped to dismiss the villagers for 64, a target which service were able to eclipse for the loss of four wickets.
Dringhouses were dismissed for an even lower score at Clifton Park where York's John Cook took 8-28 in 12.1 lethal overs.
Early season promotion contenders Dringhouses were all out for a meagre 49 leaving York to run out winners by seven wickets to re-kindle their drive to reclaim their Premier status.
All three wickets fell to Andrew Darnell at a cost of 19 runs.
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