How to Complete a Bean Stitch in the Back Loops Only 2 Together (bsblo2tog)
[Yarn over, insert your hk into the indicated stitch (blo), yarn over and pull up to working height] 1 time.
[Yarn over, insert your hook into the next indicated stitch (blo), yarn over and pull up to working height] 1 time.
Yarn over and pull through all 5 loops on the hook.
This technique combines two stitches together, resulting in a stitch decrease while maintaining the puffiness of the Bean Stitch.
Based on your pattern instructions, you may need to repeat the steps in brackets multiple times (typically 1-2 times) depending on how "puffy" the stitch needs to be for the design.